Mineralpedia Details for Andradite
A member of the Garnet Group named for J.B. d’Andrada e Silva, a Brazilian mineralogist who was the first to describe a variety of this type of garnet. Andradite is common and widespread, and good material can be found in Italy, Romania, Switzerland, Norway, South Africa, Russia, the United States, and Mexico. Hundreds of other localities ate known. Andradite occurs “in skarns from contact metamorphosed impure limestones or calcic igneous rocks, in chlorite schists and serpentinites, [and] in alkalic igneous rocks, [where there are] then typically titaniferous. Associated minerals include vesuvianite, chlorite, epidote, spinel, calcite, dolomite, and magnetite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/andradite.pdf
- Crystal System
- Crystal Habit
- Crystalline - Coarse, Euhedral Crystals, Massive
- None, None, None
- Vitreous (Glassy)
- black, yellowish brown, red, greenish yellow, gray
- Isometric - Hexoctahedral
- View Andradite
- View Andradite
Andradite from Stanley Butte, Graham Co., Arizona, United States
Single, euhedral, reddish brown, lustrous crystals to 6mm.
Dodecahedral crystals to 4mm.
Andradite from Artinite pit, Clear Creek, San Benito Co., California, United States
Beautiful yellow-brown Andradite variety Topazolite crystals from 2-5mm on all sides of matrix.
The varietal name refers to resemblance of these Garnets to Topaz, which indeed they do have that same nice clear color and adamantine luster.
Andradite from Sandare, Nioro du Sahel, Mali
Deep reddish brown lustrous crystals to 8mm.
Andradite from San Benito Co., California, United States
Light green garnet crystals to 5mm.
Andradite from Nightingale dist., Pershing Co., Nevada, United States
Deep red well-formed garnets to nearly 2cm on quartz with many others.
Andradite from Chukotskii Mountains, Chukotsky, Russia
Green crystals to 4mm.